[Openstack] Regarding replicator behavior with single replica

Vengurlekar, Tushar V (USD-SWD) tushar.vengurlekar at hp.com
Thu Sep 12 17:02:11 UTC 2013

Hi Yuan,

All my devices are up. Will replicator try to move object even though I have single replica?


-----Original Message-----
From: Zhou, Yuan [mailto:yuan.zhou at intel.com] 
Sent: Thursday, September 12, 2013 8:54 AM
To: Vengurlekar, Tushar V (USD-SWD); openstack at lists.openstack.org
Subject: RE: Regarding replicator behavior with single replica

Hi Tushar,

One possible reason is that one of your devices is unavailable when you're uploading ? 
This makes some of objects are uploaded to handoff devices actually and obj-replicator will try to move them back to primary devices.


-----Original Message-----
From: Vengurlekar, Tushar V (USD-SWD) [mailto:tushar.vengurlekar at hp.com] 
Sent: Wednesday, September 11, 2013 8:02 PM
To: openstack at lists.openstack.org
Subject: [Openstack] Regarding replicator behavior with single replica

Hello everyone,

I was trying a Swift setup having single replica configured with 4 devices added to the ring with different IP addresses.
Later (after all replication/rebalance completed) I uploaded many objects in a multiple containers.
I observe the data movement across these devices through rsync replicator daemon.

I understand that the object rebalance (using rsync) should happen only when we add devices or change weight value in ring (and if multiple replicas configured). 
So what is a reason that it performs data movement (of newly uploaded objects) without any ring changes and single replica?

Thanks in advance,

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